Sum Secret Key Rate Maximization for TDD Multi-User Massive MIMO Wireless Networks

Li, Guyue, Sun, Chen, Jorswieck, Eduard A, Zhang, Junqing ORCID: 0000-0002-3502-2926, Hu, Aiqun and Chen, You (2021) Sum Secret Key Rate Maximization for TDD Multi-User Massive MIMO Wireless Networks. IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY, 16. pp. 968-982.

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Official URL: http://dx.doi.org/10.1109/tifs.2020.3026466

Abstract

Physical-layer key generation (PKG) based on channel reciprocity has recently emerged as a new technique to establish secret keys between devices. Most works focus on pairwise communication scenarios with single or small-scale antennas. However, the fifth generation (5G) wireless communications employ massive multiple-input multiple-output (MIMO) to support multiple users simultaneously, bringing serious overhead of reciprocal channel acquisition. This paper presents a multi-user secret key generation in massive MIMO wireless networks. We provide a beam domain channel model, in which different elements represent the channel gains from different transmit directions to different receive directions. Based on this channel model, we analyze the secret key rate and derive a closed-form expression under independent channel conditions. To maximize the sum secret key rate, we provide the optimal conditions for the Kronecker product of the precoding and receiving matrices and propose an algorithm to generate these matrices with pilot reuse. The proposed optimization design can significantly reduce the pilot overhead of the reciprocal channel state information acquisition. Furthermore, we analyze the security under the channel correlation between user terminals (UTs), and propose a low overhead multi-user secret key generation with non-overlapping beams between UTs. Simulation results demonstrate the near-optimal performance of the proposed precoding and receiving matrices design and the advantages of the non-overlapping beam allocation.

Item Type:	Article
Uncontrolled Keywords:	MIMO communication, Antennas, Channel models, Security, Uplink, Downlink, Channel estimation, Physical layer security, secret key generation, multi-user massive MIMO, beam domain
Depositing User:	Symplectic Admin
Date Deposited:	15 Sep 2020 08:08
Last Modified:	15 Mar 2024 14:44
DOI:	10.1109/TIFS.2020.3026466
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3101243